REDUCED EMISSION OF FORMALDEHYDE WATER-RESISTANT PLYWOOD

UDC 674.812-419

  • Leonovich Oleg Konstantinovich − PhD (Engineering), Assistant Professor, the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: OKL2001@mail.ru

  • Bazhelka Igar Kanstantinavich − PhD (Engineering), Associate Professor, Head of the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: bikbstu@mail.ru

  • Konyakhina Olga Vadimovna − Master’s degree student, the Department of Woodworking Technology. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: ikarija88@mail.ru

DOI: https://doi.org/10.52065/2519-402X-2023-264-21

Keywords: plywood, urea-formaldehyde resin, formaldehyde, lignin, emission, strength.

For citation: Leonovich O. K., Bazhelka I. K., Konyakhina O. V. Reduced emission of formaldehyde water-resistant plywood. Proceedings of BSTU, issue 1, Forestry. Nature Management. Processing of Renewable Resources, 2023, no. 1 (240), pp. 194–200. DOI: https://doi.org/10.52065/2519-402X-2023-264-21 (In Russian).

Abstract

In the article, the research is aimed at improving the environmental safety of waterproof plywood and its strength properties. Methods and results of laboratory studies of plywood based on ureaformaldehyde resin using various adhesive compositions and modifications with depolymerized hydrolytic lignin are presented. Physical and mechanical properties of plywood and formaldehyde emission have been studied. Experimental test values for plywood glued with various adhesive compositions were processed and compared with each other. Based on the results of determining the emission class by the gas analytical method, the effect of the lignin processing product as an acceptor of formaldehyde in the production of board products was revealed. An increase in the physical and mechanical parameters of laboratory samples was achieved, in particular, the tensile strength during chipping along the adhesive layer of plywood glued with urea-formaldehyde resin with the addition of depolymerized hydrolytic lignin. The labor intensity of the technological process of mixing the adhesive composition has been reduced due to the replacement of a significant proportion of dry powdered filler components with liquid depolymerized hydrolytic lignin, which regulates the uniformity of the overall structure. The proposed technology for forming the adhesive composition makes it possible to dose the filler component by volumetric method instead of by weight.

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